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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Mount Prospect IL
National Weather Service Forecast for:
Mount Prospect IL
Issued by: National Weather Service Chicago, IL |
| Updated: 2:36 pm CDT Jun 22, 2026 |
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Tonight
 Mostly Clear
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Tuesday
 Sunny
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Tuesday Night
 Partly Cloudy
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Wednesday
 Mostly Sunny then Showers Likely
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Wednesday Night
 Chance T-storms then Chance Showers
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Thursday
 Slight Chance Showers then Slight Chance T-storms
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Thursday Night
 Partly Cloudy
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Friday
 Mostly Sunny
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Friday Night
 Chance Showers
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| Lo 54 °F |
Hi 74 °F |
Lo 58 °F |
Hi 79 °F |
Lo 61 °F |
Hi 78 °F |
Lo 58 °F |
Hi 76 °F |
Lo 60 °F |
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Beach Hazards Statement
Hazardous Weather Outlook
Tonight
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Mostly clear, with a low around 54. North wind 5 to 10 mph, with gusts as high as 15 mph. |
Tuesday
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Sunny, with a high near 74. Northeast wind 5 to 10 mph. |
Tuesday Night
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Partly cloudy, with a low around 58. East northeast wind around 5 mph becoming south after midnight. |
Wednesday
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Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 79. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. |
Wednesday Night
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A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 61. Southwest wind 5 to 10 mph. |
Thursday
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A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Chance of precipitation is 20%. |
Thursday Night
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Partly cloudy, with a low around 58. |
Friday
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Mostly sunny, with a high near 76. |
Friday Night
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A chance of showers. Mostly cloudy, with a low around 60. |
Saturday
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Mostly sunny, with a high near 80. |
Saturday Night
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A chance of showers. Partly cloudy, with a low around 65. |
Sunday
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Partly sunny, with a high near 87. |
Sunday Night
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A chance of showers and thunderstorms. Partly cloudy, with a low around 71. |
Monday
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Mostly sunny, with a high near 91. |
Forecast from NOAA-NWS
for Mount Prospect IL.
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Weather Forecast Discussion
591
FXUS63 KLOT 222342
AFDLOT
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
642 PM CDT Mon Jun 22 2026
.KEY MESSAGES...
- Dangerous swimming conditions at Lake Michigan beaches through
tonight.
- Chance of thunderstorms returns Wednesday with periodic, but
low chances for the end of the week into the weekend.
- Warmer and more humid conditions expected early next week.
&&
.DISCUSSION...
Issued at 132 PM CDT Mon Jun 22 2026
Northeast winds will gust into the 25 mph range through sunset
this evening over land and remain gusty into tonight over Lake
Michigan, allowing for high waves and dangerous swimming
conditions at Lake Michigan beaches. There may be a short period
late this afternoon when speeds/gusts increase a bit, before
then slowly diminishing into this evening.
There will be a low chance for an isolated shower or sprinkles
across northwest IL late this afternoon into this evening and
also across northwest IN, also late this afternoon. Have slight
chance pops but most of the area will stay dry.
An upper trough/closed low and associated weak surface low will
move across the Great Lakes region Wednesday into Thursday. This
will bring the next chance of showers and scattered
thunderstorms to the local area on Wednesday. Still some timing
differences for how soon this activity may reach the cwa, with
some of the models bringing precip into the northern cwa around
daybreak Wednesday morning. Additional development is possible
as a cold front moves across the area on Wednesday though low
confidence for coverage/timing. This front is then expected to
move to central IL/central IN by Thursday morning as another
wave moves east, possibly bringing showers and thunderstorms
along the general vicinity of the frontal boundary. Models then
show another wave for Thursday night into Friday, in the same
general area. While there are periodic thunderstorm chances for
the end of the week, there will also be many dry hours,
especially for areas north of I-80.
Additional precip chances Friday into Saturday will signal a
pattern change to warmer and more humid conditions as an upper
ridge builds northeast into the Great Lakes region. As trends
appear now, the best chance for thunderstorms may be in the
Saturday evening through Sunday afternoon time period as the
ridge builds northeast. Once it does, high temps by early next
week look to reach the upper 80s/lower 90s along with dewpoints
in the lower/mid 70s. cms
&&
.AVIATION /00Z TAFS THROUGH 06Z WEDNESDAY/...
Issued at 642 PM CDT Mon Jun 22 2026
No significant aviation forecast concerns for the 00Z TAFs.
Terminals reside in a region of north-northeast surface flow,
southeast of an area of surface high pressure across Manitoba,
western Ontario and the upper Mississippi Valley. Winds
currently around 15 kts will diminish with sunset, and will
remain light northerly (light and variable at KDPA/KRFD farther
to the west) overnight. Winds will turn more northeast with
mixing after sunrise Tuesday, though will not be quite as
breezy as the surface high pressure ridge edges eastward. A
lake-assist will likely provide speeds around 10 kts for
KORD/KMDW and KGYY by midday/afternoon, with winds eventually
turning more easterly late in the day before becoming light
southeast Tuesday evening.
Otherwise, VFR conditions are expected through the period.
Ratzer
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Beach Hazards Statement until 4 AM CDT Tuesday for ILZ006-
ILZ103-ILZ104.
IN...Beach Hazards Statement until 4 AM CDT Tuesday for INZ001-
INZ002.
LM...Small Craft Advisory until 1 AM CDT Tuesday for the IL
nearshore waters.
Small Craft Advisory until 4 AM CDT Tuesday for the IN
nearshore waters.
&&
$$
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